Gassing systems and methods for the production of bubble-free solutions of gas in liquid

Gas supply system, comprising: a membrane contactor having a gas contacting side with a gas inlet and a gas outlet, a liquid contacting side with a liquid inlet and a liquid outlet and a porous member, wherein a feed gas is directed under a first pressure via the gas inlet to the gas contacting side of the membrane contactor, wherein a feed liquid through the liquid inlet is directed to the liquid contacting side of the membrane contactor; a gas flow controller, which is in fluid communication with the gas inlet of the membrane contactor to control a gas flow rate of the feed gas; a liquid flow controller which is in fluid communication with the liquid contacting side of the membrane contactor to control a liquid flow rate of the feed liquid; and a device of reduced pressure which is in fluid communication with the gas outlet of the membrane contactor to reduce the first pressure on the gas contacting side of the membrane contactor to a second pressure, while preventing the porous member such that the feed liquid enters the gas contacting side of the membrane contactor, wherein the porous member allows that a lot of the feed gas passes through and ...